Multistage centrifugal pump.



J. H. SEBALD. MULTISTAGE CENTRIFUGAL PUMP. APPLICATION FILEISYNOV. rams. 1,165,543; v v Patented D8128, 1915.

J. H. SEBALD. MULTISTAGE CENTRIFUGAL PUMP.

APPLICATION FILED NOV. 14. 1913.

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r 1. H. SEB-ALD. I MULTISTAGE CENTRIFUGAL PUMP.

APPLICATION FILED NOV. 14, I913.

Patented Dec. 28, 1915.

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SGSEPH H. SEBALD. OF EASTGN. PENNSYLVANLA, ASSIGNQB T6 A. S. CAMERON STEEEM YUM "WORKS. OF NEW YORK, N. A CORIPORATZON OF NEW JERSEY.

MULTISTAGE GfEN'fR/IFUGAL PUMP.

Application filed November To all whom izrnuzy concern.

it known that I, Josnrn H. SnnALo, a

subject of the lilinperor of Austria-Hungary, having taken out my first naturalization stage fcntrifugal Pumps, of which the following is a specification.

This invention relates to multistage centrifugal pumps and has for its object first the increasing of the elilciency of such pumps and second the facilitation oi the construction. of such pumps.

The main object of my invention, namely;

the increasing of" the cllicicncy of a multistage centrifugal pump is accom 'ilishcd. broadly speaking. by the use in the stage or stages impellers discharging immediately into dillusing channels directed out Wardly, perpendicularly or substantially so, to the shaft line, these diffusing channels being provided with diffusing vanes together with a final stage in Which the inipeller conducts the fluid from the prior stage and discharges it, Without the inter vention of directing vanes, directly into a peripheral volute which is provided with a tangential discharge opening.

A practical embodiment of my invention is shown in the accompanying drawings in Whicl pump, Fig. 2 shows a ertical section of the puinp on the line of the shaft, and Fig. 3 shows a transverse section through the diffusing ring on the line Ell-lll of Fig 2.

The pump is shown a two stage comprising a casing split horizontally on ,the shaft line and divided into two chainof the eller disk 6 is a channel rin 10 rwhich is in the form of a disk of slightly smaller diameter the interior of the Specification ofLetters Patent.

are.

in the llnited States. residing at.

pump I Patented 28.1%

, Serial No. 800,930.

casing. Secured to the inlet side of the channel ring 10 is a diffusing ring 11 which has a series of diffusing vanes which are in alinenient with the blades 7 of the impeller previously described. These vanes are forwardly inclined with respect to the direction of the rotation of the impeller. On the other side of the channel ring 10 are direct ing vanes 13 which extend inwardly toward the shaft in a radial direction and serve to direct the fluid from the first impeller to the inlet of the next. The channel ring'll) is secured and held in position by a shoulder 4: on the diffusing ring 10 which en- .n annular projection 15 on the interior of the casing and by a ring 1? which is secured to the inner portions of the directing Tunes 13 and engages the inner end of the partition The diiiusing vanes 12 and the directing vanes 13 end near the outer edge of the channel ring 10 so that a peripheral chamber Without directing vanes is provided which conveys the fiuid from the diffusing vanes 12 to the return channel in which are placed the directing vanes l-fi. From the inner ends of the dirooting vanes-'13 the fluid flows into the suction opening of the impeller of the last stage which consists of a disk 2, blades 18 and a cover 19 which bends parallel to the shaft forming a. sleeve which rotates in contact with the inner surfaces of the ring 16. There are no diffusing blades provided for the last impeller but the fluid is discharged directly into the spiral volute 2G 3 ch dis charges through a tangential pipe By means of the present invention a very high eirlciency is secured for such a multistage pump. lPuinps have been chnstructed pre iously With ayolute for the final stage but such punips no diffusing have been provided for the earlier stages and like-- wise when dillusing vanes have been provided the last stage has also been provided with such vanes, greatly decreasing the efli' cieney of the pump. Althoughthe pump, as shown, has but two stages it is evident that there mighthe two or more stages constructed like the first stage in the blades radiating therefrom, .channel having forwardly inclined diffusing and modifications are included in the spirit and scope of the invention as expressed in the claims.

What-I claim is;

. 1.. In the multistage centrifugal pump, an impeller having a central fluid inlet and blades radiating therefrom, a radially directed diffusing channel having forwar ly inclined diffusing vanes therein in alinement with said impeller blades, an annular peripheral chamber into which said diffusing channel discharges, a radiallv directed fluid return channel. an impeller into which said return channel discharges, said impeller having a central fluid opening and blades adiating therefrom. and a spiral volute chamber directly contiguous to and in alinement with the outer periphery of said second impeller, said volute having a tan gential fluid outlet.

2. In a multistage centrifugal pump, an impeller -having a central fluid inlet and a diffusing vanes therein in alinement with said impeller blades, an annular peripheral chamber into which saiddiffusing channel discharges, a fluid return channel to convey the fluid to the succeeding impeller, said return cli nnel having directing vanes, an impeller into which said return channel discharges, said impeller having a. central fluid opening and blades radiating therefrom, and a spiral volute chamber into which said second impeller directly discharges, said volute chamber having a tangential fluid outlet.

3. In a multistage centrifugal pump, a

horizontally split casing forming two 1m- I second impeller and inlet of the succeeding impeller on the other face of said disk, a projecting ring on said diffusing vanes engaging a projecting shoulder in said casing, and a projecting ring on said directing vanes engaging the inner edge of said partition, said rings serving to support and position said disk.

4:. In a multistage centrifugal pump, a

horizontally split casing forming two impeller chambers, impellers in said chambers, a disk between said impellers having directing vanes leadingto the inlet of the second impeller and a ring secured'to said vanes and engaging aportion of the casing to support and position said disk; 5. In a multistage centrifugal pump, a horizontally split casing .formingtwo impeller chambers, impellers in said chambers, a disk between said impellers having directing vanes leading to the inlet of the a ring secured to said vanes and engaging a portion of the casing to support and position said disk, the second of said impellers having a cover with a sleeve portion engaging the inner surface of said ring.

In testimony whereof, I have hereunto set my hand.

' JOSEPH H. SEBALD.

Witnesses:

.Fann P. OVERTON,

An on C. BRONTUM.- 

